<template>
  <view
    v-if="!isRmove"
    :style="[
      {
        margin: props.margin[0] + props.unit + ' ' + (props.margin[1] || props.margin[0]) + props.unit,
      },
    ]"
  >
    <tm-translate
      ref="aniplay"
      :width="img_width + props.padding[0] * 2 + props.unit"
      :auto-play="false"
      name="zoom"
      reverse
      @end="aniEnd"
    >
      <tm-sheet
        :margin="[0]"
        :color="props.color"
        :transprent="props.transprent"
        :round="props.round"
        :border="props.border"
        :padding="[props.padding[0], 0]"
        :class="['round-' + props.round]"
        :width="img_width - props.padding[0] * 2"
        :unit="props.unit"
        :height="img_height - props.padding[0] * 2"
      >
        <view :class="[`pb-${props.padding[1]}`, 'flex flex-col flex-col-center-center', 'relative']">
          <image
            v-if="!error"
            :show-menu-by-longpress="props.showMenuByLongPress"
            :class="['round-' + props.round, loading ? 'opacity-0' : '']"
            :src="img_src"
            :style="[{ width: img_width + props.unit, height: img_height + props.unit }]"
            :mode="props.model"
            @load="imageLoad"
            @error="imageError"
            @click="imageClick"
          ></image>
          <view
            v-if="loading && !error"
            :style="[{ width: img_width + props.unit, height: img_height + 10 + props.unit }]"
            class="flex flex-center opacity-3 absolute l-0 t-0"
          >
            <slot name="load">
              <tm-icon v-if="props.showLoad" :font-size="26" spin :name="_loadIcon"></tm-icon>
            </slot>
          </view>

          <view
            v-if="!loading && error"
            :style="[{ width: img_width + props.unit, height: img_height + props.unit }]"
            class="flex flex-col flex-center opacity-5 absolute l-0 t-0"
          >
            <slot name="error">
              <view @click="reloadImg">
                <tm-icon :user-interaction-enabled="false" :name="_errorIcon"></tm-icon>
                <tm-text
                  :user-interaction-enabled="false"
                  _class="pt-10"
                  :font-size="26"
                  :label="props.errorLabel"
                ></tm-text>
              </view>
            </slot>
          </view>
          <!-- extra -->
          <view
            v-if="props.extra"
            :event-penetration-enabled="true"
            :class="[
              props.extraPosition == 'in' ? 'absolute l-0 b-0 zIndex-5 ' : '',
              'flex flex-col flex-col-bottom-start ',
            ]"
            :style="[
              props.extra && props.extraPosition == 'in'
                ? { height: img_height + props.unit, width: img_width + props.unit }
                : '',
              props.extra && props.extraPosition == 'out' ? { width: img_width + props.unit } : '',
            ]"
          >
            <view
              :class="['flex flex-col flex-col-bottom-start flex-1']"
              :style="[
                props.extra && props.extraPosition == 'in'
                  ? { height: img_height + props.unit, width: img_width + props.unit }
                  : '',
                props.extra && props.extraPosition == 'out' ? { width: img_width + props.unit } : '',
              ]"
              @click.stop="imageClick"
            >
              <slot name="extra"></slot>
            </view>
          </view>
          <!-- delete 展示删除按钮。 -->
          <view
            v-if="props.delete"
            class="absolute r-4 t-4 flex flex-col flex-col-center-end zIndex-10"
            :style="[props.delete ? { width: img_width + props.unit } : '']"
          >
            <tm-icon color="red" name="tmicon-times-circle-fill" @click="del"></tm-icon>
          </view>
        </view>
      </tm-sheet>
    </tm-translate>
  </view>
</template>

<script lang="ts" setup>
/**
 * 图片
 * @description 可以搭配图片组tm-image-group使用,形成一个图片相册展示。提供了预览，删除，增强内容显示。
 * @template extra图片展示的额外内容。
 */
import { getCurrentInstance, computed, ref, inject, watch, PropType, ComponentInternalInstance } from 'vue'
import tmSheet from '../tm-sheet/tm-sheet.vue'
import tmText from '../tm-text/tm-text.vue'
import tmIcon from '../tm-icon/tm-icon.vue'
import tmTranslate from '../tm-translate/tm-translate.vue'
import { custom_props } from '../../tool/lib/minxs'
const aniplay = ref<InstanceType<typeof tmTranslate> | null>(null)
const proxy = getCurrentInstance()?.proxy ?? null
const emits = defineEmits(['load', 'error', 'click', 'delete', 'close'])
const props = defineProps({
  ...custom_props,
  //外部间隙
  margin: {
    type: Array as PropType<Array<number>>,
    default: () => [0, 0],
  },
  //内部间隙
  padding: {
    type: Array as PropType<Array<number>>,
    default: () => [0, 0],
  },
  color: {
    type: String,
    default: 'white',
  },
  transprent: {
    type: [Boolean, String],
    default: true,
  },
  border: {
    type: Number,
    default: 0,
  },
  width: {
    type: [Number],
    default: 200,
    required: true,
  },
  height: {
    type: [Number],
    default: 200,
    required: true,
  },
  src: {
    type: String,
    default: '',
    required: true,
  },
  errorIcon: {
    type: String,
    default: '',
  },
  errorLabel: {
    type: String,
    default: '重新加载',
  },
  loadIcon: {
    type: String,
    default: '',
  },
  //是否显示加载动画。
  showLoad: {
    type: Boolean,
    default: true,
  },
  //是否开启预览。
  preview: {
    type: [Boolean],
    default: false,
  },
  //是否开启图片额外插槽显示内容。
  extra: {
    type: [Boolean],
    default: false,
  },
  extraPosition: {
    type: String,
    default: 'in', //in:叠加图片上显示,out：图片下方显示,
  },
  //展示关闭删除按钮。
  delete: {
    type: [Boolean],
    default: false,
  },
  //是否允许点击delete图标关闭自己，如果为false,将仅触发delete事件，本身图片不会被关闭。
  allowDelete: {
    type: [Boolean],
    default: true,
  },
  //图片绽放模式。
  //同官方阅读：https://uniapp.dcloud.io/component/image.html
  model: {
    type: String,
    default: 'scaleToFill',
  },
  unit: {
    type: String,
    default: 'rpx',
  },
  //开启长按图片显示识别小程序码菜单,与preview不冲突,可点击预览也可长按,默认不开启
  showMenuByLongPress: {
    type: [Boolean],
    default: false,
  },
})
if (!props.height && !props.width) {
  console.error('错误：图片宽度和高度必须设置一个')
}
const img_width = computed(() => {
  return props.width
})
const img_height = computed(() => {
  return props.height - props.padding[1]
})
const img_src = computed(() => props.src)
const loading = ref(true)
const error = ref(false)
const isRmove = ref(false)
const _loadIcon = ref(props.loadIcon || 'tmicon-shuaxin')
const _errorIcon = ref(props.errorIcon || 'tmicon-exclamation-circle')

//父级方法。
let parent: any = proxy?.$parent

while (parent) {
  if (parent?.tmImageGroup == 'tmImageGroup' || !parent) {
    break
  } else {
    parent = parent?.$parent ?? undefined
  }
}

const ImagGrupList = inject(
  'ImagGrupList',
  computed(() => [])
)
//向父级报送当前图片地址
if (parent?.pushKey) {
  parent.pushKey({
    width: img_width.value,
    height: img_width.value,
    src: props.src,
  })
}

watch(img_src, () => {
  loading.value = true
  error.value = false
  if (parent?.pushKey) {
    parent.pushKey({
      width: img_width.value,
      height: img_width.value,
      src: props.src,
    })
  }
})
function imageLoad(event: Event) {
  loading.value = false
  emits('load', event)
}

function imageError(event: Event) {
  console.error('图片加载错:' + props.src, event)
  error.value = true
  loading.value = false
  emits('error', event)
}

function imageClick(event: Event) {
  emits('click', event)
  if (props.preview) {
    let list = ImagGrupList.value.length > 0 ? ImagGrupList.value : [props.src]
    uni.previewImage({
      urls: list,
      current: props.src,
    })
  }
}

async function del() {
  isRmove.value = false
  if (!props.allowDelete) {
    emits('delete', props.src)
    return
  }
  if (aniplay.value?.play) {
    aniplay.value?.play()
  } else {
    isRmove.value = true
    emits('close', props.src)
  }
}

function aniEnd() {
  isRmove.value = true
  emits('close', props.src)
}
//出错时点击错误图标重新加载图片。
function reloadImg() {
  loading.value = true
  error.value = false
}
</script>

<style></style>
